iOS (iPhone/iPad/iPod Touch) - How to Find the Version of iOS Used on a Device
Apple periodically releases updates to the version of iOS used on the iPhone, iPad, and iPod Touch. This document explains how to identify which version of iOS firmware a device is using.
As referenced in the following Apple document.
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Locate and open the Settings app.
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Tap General.
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Tap About.
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Note the current iOS version is listed by Version